Metering device



E. S. CARY.

METERING DEVICE. APPLICATION FILED AUG I4. Ism.

133109739 2 sIIE Ts-sHEETI IIIIi uumJlIIIuA ....ANQGRAPII co..WASHINGTON, D. C.

Patented July 22, 1919.

E. S. CARY.

NIETERING DEVICE.

APPLlcAnoN FILED AUG.|4, 1911.

` 1,310,739. I Patented July 22,1919.

2 SHEETSSHEET 2.

' 'ruiz coLuM A mANnGRAPH co.. WASILNGTON, nv c l of orificeopeningbecomes ing to give u drawings one ent preferred by nie,

vof a meter em EGBERT s. CARY, or fPHILAJI:nimmarv risNivs'sriivliiiin.`

ivin'rnniive nnvion.

Specification of Letters lgatent.

e `AppiiatimrinedAugust11i, 1917. semina-186,120, i

AT0 all whom t 'may Concern ,Be it known that I, Eeiinn'r S. CARY, acitizen of the United States, residing at Philadelphia, in the county ofPhiladelphia and State of Pennsylvania, have invented a certain new "andusefuly Improvement in Metering Devices, of whichthe vfollowing is aspecification. i

' The present invention relates to meters for determining and indicatingthe flowof 'gases or fluids and relates more particularly 4to an airmeter of the adjustable orifice type working under the-principle thatthe volume flowing under small constantl head through multiple orificesof thesame size :and shape, is directly proportional to the number oforices exposed to the flow.` It is an object of.

vide a metering device for compressed air, gases or fluids `whereby apositive direct reading measure of fluid flow is obtainable which isaccurately compensated in relation to the dierence of pressures.

. "lt is av fiiither object of the invention to provide a meteringdevice which Vis properly calibrated tolrnownfluid currents and certainfixed differences of pressure as indicated by pressure gages whereby thedegree a measure of the current flow. fi e 1 i It has for a furtherobject to provide, in a metering device, means for correcting scalereadings for dierent densities and temperatureswhereby any'xed dierenceof pressure taken as a base canbe varied so that the measureof gas flowcan be accurately compensated with respect -to the orifice open- Ya truereading, of' current flow irrespective oil-differences in density due toressure and temperature. l i

For the "purpose of illustrating `my invention,` I have shown in theaccompanying form thereof which is1 at pressince the same has been found`in practice to `give satisfactory and reliable results, althoughitistobe understood that the various instrunientalities of which myinvention consists vcari be variously arranged andorganized and thatinyinvention is not limited to the precise arrangement and organization ofthe instrumentalities as herein shown and described.'

Figure 1 re resents a vsectional elevation odyingmy invention.

Vthe invention to proair, gas or the like, casingy body 2 and lthislatter having communication with the l be noted that about the wallsofthe cylinder 8 in the form of a helix the pitch of which bears adirect fel'ationto the means for operating the cutoff niechanismwhicli'orifices.` `This cut-off y in the present scoping with the cylinder 8witha neat slid- Fig. 2 represents a sectiononline 2-2 of Fig. 1.

Patented July 22, i919.

` Fig. 3 represents a section on line 3-3 of Fig. l.

. Fig. 4 represents an end elevation showiig1 the controlhand wheel andindicating ia .Y

` Fig. 5 represents a sectionon line 5-5 `of j Fig. 1.

Fig. `6 represents" a'detail-in 'side elevation of a portion ofthecutfoff valve.:

1 designates' generally the-casing of the device which, in the presentinstance, has the body portion pipe and its eiids'closed by `a cap 3 andT fitting 4, the latter having the inlet 5 and the outlet 6 as willbeapparent.

7 designates a receiving'chamber for the the metering cylinder 8,

outlet Gand being provided with a plurality of orices `9 arranged in apredetermined Qiformed of a length of formed between the manner in itswalls. As here shown the?A metering cylinder 8 is concentricallyarranged with respect to the body 2 and is `sufficiently less indiameter to provide `a receiving chamber 7 of proper dimensions for theVpurpose intended. It 'will `be underrectly thereto inthe preferredconstruction. In connection with the orifices 9 it should they arepreferably arranged controls 1` the said finechanism consists, instance,of a tube `10 teleinv lit and thus as it `moves axially of said cy inder8 it cuts 0H or opens, according to the direction of movement, one o-rmore of said orifices.v e i v The 'outer end of the tube 10 is rsuitablyclosed by a cap 11 which "ismounted for sliding section of which ispreferably square so that any rotary nio-vement of said rod will betransmitted to the cap 11 andv thence to the tube 10.` Since the?` tube10 is formed with la screw thread 13 engaging a fixed screw threadedfeed collar 14 it is evident movement upona rod 12, the cross Astoodthatthe i`l`t`5 has free cominunica- 'tion withthe chamber 7'anddis'chargesdi- VSince Aone revolutionof the hand .wheel l18 .movesthe tube l a distance sufficientto un- -its=piojecting end `eratingpurposes.

.spindle and also to that rotation of the tube causes it to move axiallyand telescope more or less with the cylinder 8. Preferably the pitch of'the j rod 12 isv suitably mounted axiallyofA the tube 10 for rotarymovement beingjjournaled atV one end on the pin 15 which is supported bythe cylinder. 8. and at the other` end is arrangedpas above described.

16 designates a spindle secured to the rod l2 a pin or key 17 andcarryingion a hand wheel 18 for op- Y .A` suitable stufHng Abox 19 inthe cap 3 serves as a bearing forthe prevent leakage as kwill beunderstood. V20 designates an indicating 'pointer fixed by suitableasteningidevices 21to Vthe cap 3 and having its freeI indicating end 22properly positioned with respect to the gage face or dial plate 23. Thislatteris arranged to rotate' in definite relationtothe movement of thehand wheel 18 and .in the preferred construction one `revolution of thedial plate 23" takes place while the hand wheel 18 is making thirty sixrevolutions.

cover a predetermined number of the orifices, it is evident there is apositive and fixed relation `between the reading of the dial plate and:thequantity of gas or fluid passing through the pipel orifices. The refduction gears, in the present instance, consist of a driven gear 24fixed to the spindle l16 and meshing with a second gear 25 which`carriesa pinion 26 infmesh with the gear 27 fixed to the":dialplatei23'as will be understood. While the .readingl of theldial plate 23conformsl 'to the' number of orifices ex- I v the hand wheel 18 causesthe tube 4l() to close posed to the flow, it is obvious that the small 1head -or difference inpressure existing be- Y tweentheginteriorofcylinder 8 andthe surmovement and having a fixed pointer 34 as rounding.chamber 7 must be taken into ac- Y f count.

Forthis purpose a U-tube gage is provided.y the leg 28 of which' hascommunication with the chamber 7 by way of the conduit 29 andthe leg-30with the outlet conduit Aby way a sight glass communicating at all timeswith the leg 28 through thechannel `32` and the U-tube is of coursepartially filled with a suitable liquid sojthat the differences in levelmay be readily determined.

-33 designates an indicating.

scale adjustably mounted fon the' legj 30 for sliding V,well as amovable pointer 35, the one indieating normal `level conditions Vand theother level conditions under pressure. Hence the distance between thetwo pointers becomes correspond to such 4 had `on the dial ybeen set forva ence of pressureas indicated by the position l the thread is the same.indicated by the gage.

.temperatures and a a measure of the head or difference in` pressureofthe fluid or gaspassing through the meter. Y With this in mind it isevident that a definite head maylbetaken as a working base andbyadjusting tlie'meteiing device to head a reading may be giving thetrue current flow.

In the operation of the instrument it is necessary to calibrate it byfirst 'passingf'a knownfhiid current through the casing and meteringcylinder while adjusting the number of orifices exposed to flow untilacertain Y predetermined fixed difference of pressure is vindicated onthe pressure Thus for example, assumingV the pressure gage has been setfor a three inch difference of pressure it is next necessary to vary theorifice openings untilV they are properly adjusted to give a fluid fiowcorresponding tothe head require'dand consequently this degreeof'opeiiing ofthe orifices! becomes a `definite measure of the fiuidflow. j Thereafter working with this known difference of pressure as abase the measure 4of' any given current can be quickly and accuratelydetermined by the simple method ofl orifice adjustment.

Referring more particularly operationV maybe explained more inv` -detailas in that illustration the pressure gage has predetermined fixeddifferof the. adjustable pointer 35. With an unknown current enteringthe casing through the inlet 5 it is rst necessary. to adjust thedifference of pressure between the interior ming. i, the i of thecylinder 8 and thev 4chamber 7 until the gage indicates the requiredunit `difference. This is done by ,rotating the hand .wheel 18V which,through the spindle 16 and therod l2', causes the tube l0 toKV rotateand `consequently advance axially because'of the threadfeeding means..lSince the pitch of as that of the'orifice helix it is evident'thateach'revolution of the orifices of the tube continues until the orificeopenings have been varied or adjusted to give the predeterminedAdifference in pressure as When this adjustment has been completed theexact rate of t Q flow ofthe unknown current vmay be read of pipe 31.VThe leg 30 yis frointhe dial 23 since this latter has been one at atime, and this movement operated by the rotation of the vhand wheel 18and so movedas toiiidicatel the exact data'required.

In order to make'directreadings for vari-w .1 ous pressuresandtemperatures, it will be understood that the meter is first'calibrated for a number of different pressures and definite table ofpressure and temperature values prepared, which "is to be used` inactualv operation of theineter and from which the dataf for the properadjustmentcanube obtained y and thereafter,

Vaccordance with the number of orifices ex posed to indicate the rate offluid flow.

2. In a fluid meter the combination of a casing provided with an inlet,a metering cylinder in said casing having a plurality of' orifices andadischarge outlet, a pressure gageto indicate difference of pressure be-Y tween said casing and cylinder, a device having' a definite relationto the number of orifices for indicating the fluid flow and common meansfor varying the number of orifices exposed to fluid flow and for settingsaid indicating device relative to the number of` exposed orifices.

3. vIn a fluid meter the combination of a metering cylinder having aplurality of orifices arranged in the form of a helix, a pressure gagefor indicating difference of pressure, means for successively varyingthe number of orlfices exposed to fiow, and

Y meazns controlled by said orifice varying means for directlyindicating the rate of fluid flow.

1i. In a fiuid meter the combination of a casing provided'with an inlet,a metering cylinder having a-plurality of orifices therein and adischarge outlet, said orifices being arranged in the form of a helix, avalve co- Gopies of this patent may be obtained for operating with saidvcylinder to open and close said orifices in succession, a pressure gageto indicate difference of pressure and means operating in conjunctionwith said valve and related to a predetermined difference of pressurefor indicating the exact rate of flow.

5. In a fluid meter the combination of a casing provided with an inlet,a metering cylinder in said casing having a plurality of orifices and adischarge outlet, said orifices being arranged in the form of a helix, apressure gage to indicate difference of pressure between said casing andcylinder, a valve in the form of a tube adapted to telescope with saidcylinder, la thread on said tube, a fixed leader collar for said thread,said thread having the same pitch as the orifice helix whereby saidvalve tube is moved to open or close a predetermined number of orificesfor each revolution of said tube.

6. In a fluid meter the combination of a casing provided with an inlet,a metering cylinder in said casing having a plurality of orifices and adischarge outlet, said orifices being arranged in the form of a helix, apressure gage to indicate difference of pressure between said casing andcylinder, a valve in the form of a tube adapted to telescope with saidcylinder, a thread on said tube, a fixed leader collar' for said thread,said thread having the same pitch as the orifice helix whereby saidvalve tube is moved to open or close a predetermined number of orificesfor each revolution of said tube and means controlled by said tubeoperating means for indicating the exact rate of flow.

EGBERT S'. CARY.

ve cents each, by addressing the Commissioner of Patents, Washington, D.G.

